Electrowhistle-alarm.



G. H. RBTTMANN. ELBGTROWHISTLE ALARM.

uruou1on nun rau 1911.

Patented Feb. 20, 1912.

|Illllll ll.rllllllldfl CHARLES H. RETTMANN, OF CHICAGO, ILLINOIS.

ELEOTROWI-IISTLE-ALARM.

Specification 01 Letters Patent.

Patented Feb. 20, 1912.

Application 1iled l(ay 6, 1911. Serial N0. 625,510.

T all wlwm it may concem:

ing at Chicago, in the county of Cool: and State of Illinois, haveinvented certa1n new and nseful Improvements in Electrowlustle- Alarms,of which the following is a specification. l My invention rela tes toimprovements 111 devices for producing whistling sounds.

One of the objects of my ihvent-ion is to provide an electric motor,that may be operated froni a remote point t0 set in motion air, that may'be employed 1n ass0c1at1on with a proper device for producing aWhistlin-g sound; for signaling; f0r producing msical notes, or forsounding alarms of distinctive characters.

Other and further objects of 1myinirention will be iomz readily apparentto persons skilled in the art from a consideration of the followingdescription taken.in comjunction .with the drawin'g wherein;

Figure 1 is a centr.al section of the device shoing a horn in dotted,lines; and

Fig. 2; is a [ilan view of the casing and the contained electric motorwith the top re- 4 a chamber 6, which latter Contains an e1ectridmotor,consisting of an elect-ro-magnet 7, comprising coils 8 and 9, net

roviding magpoles 10and 11 respechvely, joined t0 the mtegral yoke 12,as by scr ews 13 and.

14. responsive armatur'e 15 is pivoted m a frame 16, as at 17, so thatit may move frely within a field near the magnet poles 10 -and 11-. Theframe 16 is secured to the Wall of the casing, as by screws 18. Thecover 19 is preferably adaptedfor screw threaded engagement with theopen end of the casing 5, as at 20, und to bulge outwardly as at 21.Fixed to the interior surface of the cover, underlying the bulgedportion 21, is a similarly inwardly-curved piece 22, secured to thecover, as by pins 23,

orv otherwise, to .provide therebetween a chamber 24. The piece 22 undthe art 21 are axially perforated 'as at 25. Wiien air is ;forciblydriven through the perforations, 25, the air is set into Vibration toproduce sound in well known mahnen That the electric mdtor may producethe desired draft of air, I cover the qpening of the casing With adiaphragm preferably of Be itkhown that I, CHARLES H. Rnrr MANN, acitizen 0f the United States,-res1drubber 0r other similarly flexiblematerial-and secure it at its edges to a metallic annulus 27, to aifordsupport for said diaphragm. Near the central region of the diaphragm Isecurd a disk 28, preferably metallic, to serve as a plunge'r, to adegree, when the diaphragm is vibrated and to act as a wearing plate. Aspring 29 is seoured to the cover 19, as at- 30, its free-end bearingupon the diaphragm near its center and yield ingly holding it in aninwardly inclined position against the action of the motor. An arm 31fixed for movernent with the armature 15, as by screws, bears upon theplate 28, on substantially the opposite position of the diaphragmcontrolled by spring 29.

When theelectro-magnet is ener,gized the diaphragm Will be pushedout'wardly by the arm 31,- against the spring 29 and cause a draft ofair t0 be forcibly projected through the p'erforations 25, therebyproducing a whistle-like note. 'Whsn the electro-n'mgn6t is denergizedthe diaphragm 26 will be returned to its original positipn by the spring29, thus causing another draft of air to pass.through the perforations25, and thus producing another whistl'ing ir'npulse. If n 0w thediaphragm be rapidly moved in alternate directions, there Will beproduced thereby a succession of cdrrespondin whistl ing impulses. T0t.his end I provi e a vibrat 'ing means in the contact spring 32 securedto an insulating block 33 carriedby the armature 15, in coperativerelation with the inlsulated contact screw 34, substantially such anarrangement as is usuall y applied to a vibrating hell.

One end of the windings ofthe coils -8 and 9, is connected t0 the frame,as at 35. the other end is connected to the insulated contact spring 32.T0 the terminal screw 36 mounted upon the cover in eleetrical connectiontherewith und with the casin is attached one wire 37 of the circnit.W1re 38 is inay Dia 1ised as an alarm signal for automobiles, or it maybe used in other situations where it isdesirable that ihshall beoperated from a remote eint, and a lur-ality 0f such devices, a apted topro3uce s0 unds varying in chiaracter, could be" us'ed a amusic-producing instxument.

While Ihave' herein disclosed' a single embodiment of 1t1y.invention itisevid'ent that chan ges within the spirit and scope f theclaims may bemade without departure from my invention. v

Having described my invention, what .I'

claim is:

1. In a 'device of the charactem described,

the combination with a casing, an electromagnet; therein, of a covertherefor, means on the cover operable by impulses of air to producesound, -a diaphragm, and dia' hragm moving means associated With sa1dd1aphragm .and m:ignet. tn' produce impulses of air for the sound' roflucing -means.

2. In a devioe 0Fth e character described, the combination withualcasingg, a perforate closure therefor, a flexible diaphragm dividi1'1gsaid casing intqtwo, co1hpartments, an electro-magnet in onecompartment, an nieans connecting said magnet' und diaphra gm t0vibrate'-tha latter whereby air in the ot-her compartment is caused tobe projected from und drawn in throtigh said perforation tb produce awhistling sound.

3. In a device of the character described, the combination with acasing, a perf0rate closure therefor, a flexible.diaphr'agm dividingsaid casing int o two compartments, an electro-magnet in 'onecompartrnent, means connecting said magnet and diaphragm to vibrate thelatter to produce air curren'ts to and from the other compartrnentthrough said perforations; und a sound-producing means in the path ofsaid air currerits.

4. In a deviceof the charactep described, a casing, a cover t-berefof,means upon the cover operable by impulseS of air to produce a sound, adiaphragrn dividin said casing into two compartments, means m one saidcompartineht to hold said diaphragin yieldin'gly tbward 't-he othercompartment, und means in said other compart-ment to move the diaphragmback against said yieldin means 'to cause impulses of air, compr1sing anelectromagnet, an armature therefor, an arm movable by said armature' topress against said diaphragm, and suitable e1ectric contacts t0 controlsaid electromagnet.

5. In a deviCe of thebharacter described, a casing, means on a wall ofthe casing operable by impulses of air to produoe a sound, a diaphragrnin said casing, a spring upon one s1de of said diaphiragm bearing uponthe diaphraghn ne'ar its center, and means upon the other side- 0f thedia hragm t0 .move it against the efl'ect of sai s"pring t0 produce animpulse of air eompxising an electromagnet, an armature moved ther6by,und an arm 31 fixed at ona end to said armature, and at its other endarrariged to bear against said diaph-ragm 'near its center when 'thearmature is attracted.

of its mqvement and mea'ns within the casing to move sa1d diaphragm against said yielding means to force air frmn said air space fon theproduction 0f an impulse of air. In testimo'ny whereof I hereunto set myband in the presence of two witnesses.

CHARLES H. RETTMANN.

In the presence of- F OREE BAIN, MARY F. ALLEN.

